Square battery anti-explosion valve structure

Abstract

The utility model discloses a square battery anti-explosion valve structure, which relates to the technical field of batteries and sequentially comprises a welding part and a blasting part which are connected with each other from outside to inside, the blasting part is engraved with a pressure relief valve opening line with a reserved notch around the welding part, the notches are formed at the two tail ends of the welding part, and the welding part and the blasting part are connected with each other. The two ends of the valve opening connecting shaft are connected with the notches of the pressure relief valve opening lines, the height of the valve opening connecting shaft is larger than that of the pressure relief valve opening lines, a plurality of control lines are carved in the portion defined by the pressure relief valve opening lines, and the control lines divide the blasting portion into a plurality of portions with the balanced area. According to the pressure relief valve opening line, the valve opening connecting shaft and the control lines, the valve opening pressure of the anti-explosion piece is more stable and concentrated, the strength distribution is more stable, natural cracking is avoided, it is guaranteed that the battery does not crack or leak air within the safety range, and when the set valve opening value is exceeded, the valve can be opened in time for pressure relief.

Description

Technical Field

[0001] This utility model relates to a wide range of fields, specifically a square battery explosion-proof valve structure. Background Technology

[0002] With the rapid development of electric vehicles, drones, and other fields, lithium batteries have been widely used as high-energy-density power sources. However, when lithium batteries are overcharged, short-circuited, or damaged by external forces, they may generate excessively high internal pressure, potentially leading to explosions or fires and posing significant safety hazards. Therefore, improving the safety performance of battery packs has become a focus of industry attention, and the development of explosion-proof valves, as an important component of battery safety protection devices, is particularly crucial. The main principle of explosion-proof valves is to prevent battery explosions by controlling the internal pressure of the battery. When excessively high pressure is generated inside the battery, the explosion-proof valve automatically opens, releasing high-pressure gas into the external environment, thereby reducing the internal pressure of the battery and effectively preventing the risk of explosion.

[0003] Existing explosion-proof valves exhibit large pressure fluctuations during relief. When these fluctuations are significant, the pressure inside the container or pipeline changes drastically. Such pressure fluctuations may exceed the equipment's tolerance, leading to damage or failure of equipment components. There is also a risk of spontaneous cracking, which severely affects the sealing performance, resulting in the inability to effectively control the internal pressure of the equipment and consequently damaging its structure. Furthermore, the size of explosion-proof valves cannot be reduced in confined spaces to lower the explosion-proof pressure, posing a safety hazard. Utility Model Content

[0004] The purpose of this invention is to provide a square battery explosion-proof valve structure to solve the problems mentioned above.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A square battery explosion-proof valve structure includes, from the outside to the inside, a welded portion and a bursting portion. The bursting portion is characterized by a pressure relief valve opening line with pre-reserved notches engraved around the welded portion, with two ends forming the notches. A valve opening connecting shaft connects to the notches of the pressure relief valve opening line at both ends. The height of the valve opening connecting shaft is greater than the height of the pressure relief valve opening line. Multiple control lines are engraved inside the portion enclosed by the pressure relief valve opening line, dividing the bursting portion into multiple evenly spaced parts. The valve opening area formed by the pressure relief valve opening line, the valve opening connecting shaft, and the multiple control lines allows for more concentrated and stable pressure on the explosion-proof valve, and enables timely release of internal stress during the stamping process.

[0007] As a further embodiment of this invention, the explosion-proof valve is an elliptical plate, a kidney-shaped plate, a rectangular plate with rounded corners, a rhomboid plate with rounded corners, or a triangular plate with rounded corners. This allows for miniaturization of the components based on the size of different battery cells, while ensuring adequate pressure relief, thus offering wide adaptability.

[0008] As a further embodiment of this utility model: the control line is straight, parabolic or arc-shaped, the control line is symmetrical along the center line of the explosion-proof valve, and the endpoints of the control line can be connected to or disconnected from the pressure relief valve opening line.

[0009] As a further improvement of this invention, the width of the welded portion is less than 3mm. This allows for a larger valve opening area to be designed within a limited space.

[0010] As a further improvement of this invention: the cross-section of the pressure relief valve opening line is a symmetrical V-shaped groove with a circular arc transition line on the bottom surface. This allows the thickness of the pressure relief valve opening line to remain unchanged at the bottom while adjusting the angle of the controllable groove.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] 1. In this utility model, the opening pressure of the explosion-proof valve can be precisely adjusted through the pressure relief valve opening line and the valve opening connecting shaft. At the same time, after the explosion-proof valve is opened, the opening part is connected to the main body to prevent conductive metal shavings from falling off and splashing into the battery pack, causing a short circuit and fire.

[0013] 2. In this utility model, the pressure relief valve opening line presents a shape consistent with the appearance of the explosion-proof valve, which controls the opening area of ​​the explosion-proof valve. In a limited space, the opening area can be maximized, ensuring structural stability while compressing the space occupied by the structure. This can reduce the size of the battery cell structure and improve the energy density of the battery. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the elliptical explosion-proof valve structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the structure of the oval-shaped explosion-proof valve of this utility model;

[0016] Figure 3 This is a schematic diagram of the rectangular explosion-proof valve in this utility model;

[0017] Figure 4 This is a schematic diagram of the structure of the rhomboid explosion-proof valve in this utility model;

[0018] Figure 5 This is a schematic diagram of the triangular explosion-proof valve in this utility model;

[0019] In the diagram: 1. Welding section; 2. Explosion section; 21. Pressure relief valve opening line; 22. Valve opening connecting shaft; 23. Control line; 231. First control line; 232. Second control line; 233. Third control line. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Example 1:

[0022] Please see Figure 1 In this embodiment of the utility model, a square battery explosion-proof valve structure includes, from the outside to the inside, a welded part 1 and an explosion part 2 connected to each other. The explosion part 2 is characterized by having a pressure relief valve opening line 21 with a reserved notch engraved around the welded part 1, wherein the two ends form notches, and the two ends of the valve opening connecting shaft 22 are connected to the notches of the pressure relief valve opening line 21. The height of the valve opening connecting shaft is greater than the height of the pressure relief valve opening line 21. Multiple control lines 23 are engraved inside the part enclosed by the pressure relief valve opening line 21. The control lines 23 divide the explosion part into multiple parts with equal area.

[0023] Among them, the explosion-proof valve is an elliptical disc.

[0024] Among them, the control line 23 is straight, parabolic or arc-shaped, and the control line 23 is symmetrical along the center line of the explosion-proof valve. The endpoints of the control line 23 can be connected to or disconnected from the pressure relief valve opening line 21.

[0025] Among them, the control line 23 includes a first control line 231, a second control line 232, and a third control line 233. The straight line where the first control line 231 is located is the central symmetry line of the explosion-proof valve. The second control line 232 is perpendicular to the first control line 231. The third control line 233 is symmetrically engraved at the two ends of the second control line 232. The third control line 233 is parabolic or arc-shaped.

[0026] Among them, the pressure relief valve opening line 21, the valve opening connecting shaft 22, the first control line 231, the second control line 232, and the third control line 233 divide the explosion-proof valve into six parts with equal area, as well as a part between the valve opening connecting shaft 22 and the welding part 1. These seven parts can be flat or protruding curved surfaces, with the protruding part ≤1.5mm. While ensuring structural stability, the compressed structure occupies space, which can reduce the size of the cell structure and increase the battery density.

[0027] Among them, the width of welded part 1 is less than 3mm.

[0028] The pressure relief valve opening line 21 has a symmetrical V-shaped groove with a rounded transition line on the bottom surface. The thickness of the pressure relief valve opening line 21 is constant at the bottom, but the angle of the groove can be adjusted.

[0029] Example 2:

[0030] Please see Figure 2 The structure of the square battery explosion-proof valve in this embodiment is similar to that in embodiment 1, except that the explosion-proof valve is an oval plate.

[0031] Example 3:

[0032] Please see Figure 3 The structure of the square battery explosion-proof valve in this embodiment is similar to that in embodiment 1, except that the explosion-proof valve is a rectangular plate.

[0033] Example 4:

[0034] Please see Figure 4 The structure of the square battery explosion-proof valve in this embodiment is similar to that in embodiment 1, except that the explosion-proof valve is a diamond-shaped piece.

[0035] Examples 1-4 show that the shape of the explosion-proof valve can be adjusted according to assembly requirements. Various structural shapes can adapt to various extreme spaces and adjust the explosion-proof pressure, making it highly adaptable.

[0036] Example 5:

[0037] Please see Figure 5 The structure of the square battery explosion-proof valve in this embodiment is similar to that in embodiment 1, except that the explosion-proof valve is a triangular piece, wherein the straight lines containing the control line 23 are all angle bisectors of the triangle, and the first control line 231, the second control line 232, and the third control line 233 extend outward from the incenter of the triangle and bisect the three included angles of the triangle.

[0038] Among them, the pressure relief valve opening line 21, the valve opening connecting shaft 22, the first control line 231, the second control line 232, and the third control line 233 divide the explosion-proof valve into three parts with equal area and a part between the valve opening connecting shaft 22 and the welding part 1. These four parts can be flat or convex curved surfaces, with the protruding part ≤1.5mm.

[0039] Because of its stable structure, the triangle shape results in a more uniform distribution of internal stress after the explosion-proof valve is formed. Under the same explosion-proof area and valve opening pressure, the explosion-proof pressure is more concentrated and stable, which greatly improves the safety of battery use and extends battery life.

[0040] The working principle of this utility model is as follows: there is a height difference between the valve opening connecting shaft 22 and the pressure relief valve opening line 21, so that the strength of the valve opening connecting shaft 22 alone can adjust the opening pressure of the explosion-proof valve. At the same time, it controls the connection between the opening part and the explosion-proof valve body after the explosion-proof valve is opened, so as to avoid conductive metal shavings falling off and splashing, causing short circuit and fire inside the battery pack.

[0041] Under normal battery operating conditions, the explosion-proof valve is closed to ensure the battery's internal seal and prevent external gas or moisture from entering the battery. When the battery pressure becomes abnormal, the pressure relief valve line 21 responds quickly and automatically opens the valve connection shaft 22 to release the high-pressure gas inside the battery.

[0042] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A square battery explosion-proof valve structure, which comprises, from the outside to the inside, a welding part (1) and an explosion part (2) in sequence, characterized in that: The blasting part (2) is provided with a pressure relief valve line (21) with a reserved notch around the welding part (1), wherein two ends of the pressure relief valve line (21) form the notch, and an open valve connecting shaft (22) is connected to the notch of the pressure relief valve line (21), the height of the open valve connecting shaft is greater than the height of the pressure relief valve line (21), and a plurality of control lines (23) are engraved in the part surrounded by the pressure relief valve line (21), and the control lines (23) divide the blasting part into a plurality of parts with equal areas.

2. The square battery explosion-proof valve structure according to claim 1, characterized in that: The explosion-proof valve is an oval piece, a waist round piece, a rectangular piece with a round corner, a rhombic piece with a round corner or a triangular piece with a round corner.

3. The square battery explosion-proof valve structure according to claim 1, characterized in that: The control lines (23) are in a straight line type, a parabolic type or a circular arc type, the control lines (23) are symmetrical along the center line of the explosion-proof valve, and the end points of the control lines (23) can be connected or disconnected with the pressure relief valve line (21).

4. The square battery explosion-proof valve structure according to claim 1, characterized in that: The width of the welding part (1) is less than 3 mm.

5. The square battery explosion-proof valve structure according to claim 1, characterized in that: The cross section of the pressure relief valve line (21) is a symmetrical V-shaped line groove with a circular arc transition line on the bottom surface.

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